I'm starting to get the feeling that Thudd is not really suited to a 4-2-3-1, and that his inclusion is partly the reason that the AM is currently looking so isolated.
Last season we had Vdv, yes Vdv is a superior player to any of our AM's this season, however he also had Modric. Modric is far more Mobile, creative, willing to look for space and play a one-two and able to get out of a tight spot. His interplay with VDV was what bought Vdv into the game, other then that Vdv was usually in the game via dropping deep which was of detriment to our attacking threat.
This however is not really Thudd's game, he is far more the type of player that will sit back deep and fling passes around the park. They are accurate passes mind, but it means that:
1: The ball won't get to the AM very often, Sig and Dempsey are going to lose a long ball the majority of the time as they are not that kind of player.
2: When the AM does get the ball they don't have anyone looking for that easy pass into space a la Modric used to do, and even if Thudd does once in a while, he's not the type of player to excel in a tight spot. He does far better with time on the ball.
I get the feeling this is partly why Thudd excelled in a classic 4-4-2, because he got the ball out to the wingers quickly and they were able to cross to two men in the box able to do some damage, however in our current 4-2-3-1 they only have the one player in the box (currently defoe who is not exactly a huge threat in the air) because the AM is sitting outside the box. If the ball does get to the striker and he controls it he's pretty much isolated, much as the AM is being.
In a 4-3-3 i think Thudd would be more effective. Stick Sandro, for the defensive work, Thudd, for the creativity and Dembele (or perhaps a better passing player a la moutinho) to link it all together and run with the ball i think it would be far more successful. Partly because we would no longer have the issue of the isolated AM or the possible isolated ST and we would actually be playing with eleven men again.